Abstract
Hierarchical graphene@Fe3O4@SiO2@polyaniline quaternary composite is fabricated subtly. Their microwave absorption properties are also investigated in the 2–18GHz frequency range. Transmission electron microscopy (TEM) and scanning electron microscope (SEM) reveal that Fe3O4@SiO2@polyaniline core@shell@shell heteronanostructures are densely covered on the surfaces of graphene, and form hierarchical structures. Compared with two-dimensional binary nanocomposites of graphene@Fe3O4, the hierarchical structure exhibits enhanced EM absorption in terms of both the maximum reflection loss value and the absorption bandwidth. The maximum reflection loss value can reach −40.7dB at 12.5GHz with a thickness of 2.5mm and the bandwidth corresponding to the reflection loss below −10dB is 5.8GHz (from 10.5 to 16.3GHz).
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